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  1. #1
    Join Date
    Sep 2019
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    Thermostat Assistance

    We have a home with a natural forced air furnace and an air conditioner with a heat pump for emergency heat. We are looking to replace the existing thermostat (picture attached) with a programmable thermostat. We have been trying to find a programmable thermostat that is compatible with this system but are not seeming to have any luck. When we hook up a programmable thermostat the furnace and the AC unit will operate; however, the default function for the AC is emergency heat, not AC. We can not figure out to get the AC to toggle to AC instead of heat with the programmable thermostats. Any suggestions?
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  2. #2
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    11,243
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    You’ll want to find a programmable thermostat with auxiliary heat lockout.
    Otherwise your energy saving setback thermostat will actually increase your heating bill.
    Heat pumps work best maintaining a constant setpoint. Not fluctuating back and forth.
    “I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison

    “It’s not whether you get knocked down, it’s whether you get up.” - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486

  3. #3
    Join Date
    Dec 2007
    Posts
    9,031
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    The stats you have purchased may have been correct, but not knowing how to wire or program them indicates this is outside your DIY knowledge.

    Call a professional before you cause damage to something: control board, components, etc.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

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